Any recommendations for a 'halfway house' between a bottle and a cup?

DS is nearly 1. He was EBF until 6 months, then mix fed until 10 months and fully formula fed since then. He really loves his milk and can still have 4 bottles a day (including at least 1 night feed - thought we'd got rid of them, hence giving up the convenience of breastfeeding but he had other ideas!)

He eats a good solid diet too - 3 decent meals plus snack so it's not as if he is drinking milk instead of eating - I think he genuinely still needs quite a lot. It is obviously a comfort thing for him too.

He will drink from a tommee tippee cup but not a great deal and it's a bit messy so wondered if there was a decent middle ground that would enable him to get enough milk whilst moving away from bottles.

Don't stress too much about the amount of milk, my DS still had 4 well after one and wouldn't take it from any container other than a bottle! Catsbums from HVs and mummy friends, but DS seemed happy so I let him continue and at 14 months he's down to just one morning and eve. It's not the law they have to move on from bottles he has water from sippy cups at meals and in between anyway, but milk=comfort=bottle. No matter, so if you can't find anything to suit, don't worry. I think of it like extended breastfeeding in a way - he still needs/wants the comfort of a soft teat in a mummy cuddle so he can still have it. Obviously as long as they're getting enough food, it's just literally a comfort thing anyway, and night wakings could be for any one of a gazillion reasons.

We have so many different cups in our cupboard! By far the best we've found is the Tommee Tippee water bottle with a flip-up straw, really good for out and about too as it's non-spill and doesn't leak when you flip the straw down (so you can chuck it in your bag). And for in the house, the Vital Baby 3 in 1 trainer cup - DS started with the spout but moved on to the lid with a sippy hole at about 15/16 months. Only £3.99 from Amazon!